v3.25.2
Commitments and Contingencies - Financial Instrument with Off-balance-sheet Risk (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Commitments to originate loans and leases:    
Unadvanced portion of loans and leases $ 952,115 $ 1,076,783
Unused lines of credit:    
Home equity 807,749 780,214
Other consumer 129,642 113,838
Other commercial 429 398
Unused letters of credit:    
Financial standby letters of credit 9,695 12,702
Performance standby letters of credit 28,040 24,325
Commercial and similar letters of credit 2,206 2,330
Interest rate derivatives    
Unused letters of credit:    
Notional amount 225,000 225,000
Receive fixed, pay variable    
Unused letters of credit:    
Notional amount 1,425,875 1,672,948
Pay fixed, receive variable    
Unused letters of credit:    
Notional amount 1,425,875 1,672,948
Risk participation-out agreements    
Unused letters of credit:    
Notional amount 430,619 539,731
Risk participation-in agreements    
Unused letters of credit:    
Notional amount 100,934 102,198
Foreign exchange contracts | Buys foreign currency, sells U.S. currency    
Unused letters of credit:    
Notional amount 5,560 5,849
Foreign exchange contracts | Sells foreign currency, buys U.S. currency    
Unused letters of credit:    
Notional amount 5,105 5,408
Commercial real estate    
Commitments to originate loans and leases:    
Commitments to originate loans and leases 40,672 11,126
Commercial    
Commitments to originate loans and leases:    
Commitments to originate loans and leases 111,854 144,721
Residential mortgage    
Commitments to originate loans and leases:    
Commitments to originate loans and leases $ 24,646 $ 14,607